ES2060113T3 - CONTRAST CONTROL SYSTEM AND PROCEDURE FOR A THERMAL WRITING HEAD. - Google Patents

CONTRAST CONTROL SYSTEM AND PROCEDURE FOR A THERMAL WRITING HEAD.

Info

Publication number
ES2060113T3
ES2060113T3 ES90403412T ES90403412T ES2060113T3 ES 2060113 T3 ES2060113 T3 ES 2060113T3 ES 90403412 T ES90403412 T ES 90403412T ES 90403412 T ES90403412 T ES 90403412T ES 2060113 T3 ES2060113 T3 ES 2060113T3
Authority
ES
Spain
Prior art keywords
contrast control
printer
elements
series
adjusted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
ES90403412T
Other languages
Spanish (es)
Inventor
Christian Lavergne
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sagem SA
Original Assignee
Sagem SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sagem SA filed Critical Sagem SA
Application granted granted Critical
Publication of ES2060113T3 publication Critical patent/ES2060113T3/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/35—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads providing current or voltage to the thermal head
    • B41J2/355—Control circuits for heating-element selection
    • B41J2/36—Print density control

Landscapes

  • Electronic Switches (AREA)
  • Facsimile Heads (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)

Abstract

The subject of the invention is a method of contrast control for a print medium produced by a thermal print head (1) of a printer of a data transmission system comprising a series of resistive elements arranged to be activated by the passage of a current provided by a card (3) linked to a source of power (4) and in order thus to heat. The activation times of the elements are adjusted at the start of printing for a print cycle of minimal duration. For longer cycles, the elements are reactivated (14) as soon as their temperature while falling reaches the initial temperature, by a series of holding microcycles with very short durations of activation. If the printer of a fax machine is concerned, to which the invention applies particularly well, contrast can thus be adjusted as a function of the nature of the quality of the thermosensitive paper and of the rendering which it is desired to obtain with respect to an original document. <IMAGE>
ES90403412T 1989-12-07 1990-11-30 CONTRAST CONTROL SYSTEM AND PROCEDURE FOR A THERMAL WRITING HEAD. Expired - Lifetime ES2060113T3 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8916181A FR2655592B1 (en) 1989-12-07 1989-12-07 METHOD FOR CONTROLLING THE CONTRAST OF A PRINTING MEDIUM PRODUCED BY A THERMAL WRITING HEAD AND PRINTING SYSTEM IMPLEMENTING THE METHOD.

Publications (1)

Publication Number Publication Date
ES2060113T3 true ES2060113T3 (en) 1994-11-16

Family

ID=9388251

Family Applications (1)

Application Number Title Priority Date Filing Date
ES90403412T Expired - Lifetime ES2060113T3 (en) 1989-12-07 1990-11-30 CONTRAST CONTROL SYSTEM AND PROCEDURE FOR A THERMAL WRITING HEAD.

Country Status (6)

Country Link
EP (1) EP0432024B1 (en)
AT (1) ATE108728T1 (en)
DE (1) DE69010859T2 (en)
DK (1) DK0432024T3 (en)
ES (1) ES2060113T3 (en)
FR (1) FR2655592B1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975707A (en) * 1970-04-13 1976-08-17 Canon Kabushiki Kaisha Device for controlling the density of printing characters
JPS6327271A (en) * 1986-07-18 1988-02-04 Shinko Electric Co Ltd Thermal transfer printer
JPS6318259U (en) * 1986-07-22 1988-02-06
JPH0632943B2 (en) * 1986-10-20 1994-05-02 株式会社日立製作所 Thermal transfer printer

Also Published As

Publication number Publication date
ATE108728T1 (en) 1994-08-15
DK0432024T3 (en) 1994-11-21
EP0432024B1 (en) 1994-07-20
FR2655592B1 (en) 1995-04-07
DE69010859T2 (en) 1995-03-09
FR2655592A1 (en) 1991-06-14
DE69010859D1 (en) 1994-08-25
EP0432024A1 (en) 1991-06-12

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